SLF4j and JCL is a logging facade, it doesn’t do logging by themselves instead depends on the logging component like Java Util Logging builtin with Java Log4j development ended 2015 doesn’t support Slf4j natively Log4j2 successor to Log4j more “advanced” than Logback Logback successor to Log4j less performant than Log4j2? Resources https://stackify.com/compare-java-logging-frameworks/ Other 6 - Logging & Monitoring & Metrics